You think it is a step in the right direction while acknowledging it breaks adblockers. You're going to have to explain why you're cool with that, because as it stands your post just isn't cohesive at all (as far as I can tell).
This isn't a single, monolithic change, there's plenty of changes between manifest V2 and V3. GP said he thought most of these changes are a step in the right direction, while expressing concern about one of the others. That seems like a cohesive and nuanced opinion to me.
It sounds like deflection and rationalization to me.
Not all features are equally important, the one seeing a regression is much more important, it's also the feature with a conflict of interest, and the conflict of interest lies in the direction of Google pushing this through over everyone else's objections.
I was in the process of writing a reply when I realised you presented the same arguments in a much more concise manner. For the record, this is what my problem was with the argumentation presented.
